Carbureter.



C. L. RAYFIELU,

cmzum'sa.

APPLICATION FILED AUG.23. i912. @d-Se Paente May L EQU.

f iii 1 C. l.. RAYFIELD.

GARBURETER.

APPLICATION FILED AUG.23. 1912.

@ meme@ my 1, 1917.

3 SHEETS-SHEET 2.

@j b' 5i C. vl.. RAYFIELD. CARBURETEH.

APPLICATION FILED AUG.23. 1912.

Patemf May l, 19M.

3 SHEETS-SHEET 3.

III 9U, DI@ A HAELES L. RAYFIELD, 0F CHCGO, LLKNOTIS.

aeaaeoe.

Specification of' Letters Patent.

Patented May il,

Application led August 213, 1912. Serial No'. 716,616.

To ali Lo/icm may concern:

lle it known that l, @Hannes L. Barriere, a citizen of the United States, and e resident of the city of Chicago, in the county of @ook and State of llinoishave invented certain new and useful improvements in `Carlnxreters; and l do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, and to the numbers of reference marked thereon, which form a part of this specification.

This invention relates to improvements in carbureters for internal combustion engines, and has for its object, first, a preliminary supply of a rich mixture for the engine in starting, and thereafter with the opening of the throttle to vary the mixture as required to suit the load and speed commensurate with the throttle opening.

is an object of the invention to afford a construction wherein the air supply to the mixture under all running conditions, is controlled by the degree of throttle opening, thus insuring perfect combustion and highest ethciency under all operating conditions.

lt is an object'of the invention to afford a construction whereby a given carbureter may be adjusted to supply the fuel requirements of any combustion engine, and in which the adjustmentsl having once been effected, remain constant under all conditions of load service.

lt is also an object ofthe invention to afford a carbureter capable of ready and accurate adjustment by one not previously trained or skilled, and in which reliability und perfect fuel control is assured.

It is also an object of the invention to afford a construction whereby the throttle may he turned from high to low, or to any adjustment instantly, the engine responding perfectly for the adjustment and without back Firing or missing.

lt is an object of the invention also to afford an improved construction for more thoroughly mixing the charge, and in which 'vibration or fluttering of the controlling valve or valves because of the draft of the motor thereon, or because of inequalities in the road, are absolutely precluded.

It is finally an object of the invention to afford a carburetor of the utmost simplicity, durability and efliciency, and adapted for use under any and all conditions of service. l

The invention (in a preferred form) is pipe) is connected yin the carburetor.

illustrated in the drawings, and hereinafter more fully described.

tn the drawings:

Figure 1 is a side eleva"` of i carbo reter embodying my Fig. 2 is a top plan view t* eof.

Fig. 3 is a section on line 3 of Fig. d is a section on line of llig.

Fig.r 5-is an enlarged fragmentary end elevation.

Fi f is an enlarged, fragmentaryl detail, in which the. oy-pass of the fuel supply to a point beyond the throttle valve, isf effected through the stem' of the needle valve.

Fig. 7 is anenlarged section on im-'i4' of Fig. 4.

Fig. 8 is a section on line 8 8 of Fig'.

As shown in the drawings:

. A casing of suitable metal or other ma terial, is constructed to afford the float feed chamber A, and mixing chamber B, with related connections, and with the needle valve arranged intermediate said chambers.

Said float feed chamber and mixingcham'- ber may be constructed integrally, as shown, if preferred, said float feed chamber being cylindric in form, and provided aXially at its bottom with an apertured internally threaded boss 1, in which is threaded a plug 2, provided with a. threaded aperture therein, in which may be engaged a pet cock to permit draining the float feed chamber should it be desired.

Said float feed chamber extends forwardly at its bottom and is provided in its bottom with an internally threaded boss 3,

titl

in which is threaded a plug d, having a restricted aperture therethrough, which affords an upwardly facing valve seat, as shown in Fig. 3, and threaded into the lower end of said plug is a union nut 5, whereby the gasolene (or other hydro-carbon supply forward extension of the ioat feed chamber is provided near the middle of the height of said oat feed chamber with a horizontal top Wall 6, in which is threaded a nozzle 7, which o ens upwardly therethrough in a restrictedj passage, and into which extends the needle 8, of the needle valve to regulate and control said passage, said needle, as shown, being integrally connected with a cylindric stem 9, slidably engaged in the wall of the carbureter in axial alinement with said nozzle 7.

A. needle valve is also provided to con- Said' into the dash pot chamber, and

v the same, and secured on which at its upper l 7 'housing 44, integral wlth said cover, and

trol the inlet of hydro-carbon fuel to the4 iioat feed chamber, and for this purpose the needle point 10, lits into the restricted aperture in the plugyt, before described, and is integrally connected with a sleeve 11, which extends upwardly and loosely receives the lower end of the nozzle 7, therein, as shown in l? ig. 3. As shown, a double yoked lever 12, is pivotally supported upon a lug 13, secured in any suitable manner in the bottom of the float feed chamber between the needle valve and axis of said chamber, and, as shown, at one of its yoked ends engages aroundthe sleeve 11, of the inlet needle valve engaged beneathja downwardly faced shoulder thereon, and at its other end receives the stem 14, of the float 15, in said float feed chamber therein, a ball 16, on said stem, bearing upon the vtop of said yoke, as shown in Fig. 3, and affording a ball and socket joint thereon, and said ioat, as shown, being adjustal'ily supported on the stein 1l, by means of a clamping collar 17, secured on said Vfloat and through which said stem extends, so that with the rising of the float above normal, the inlet needle valve seats and closes by gravity. l/Vith the descent of the float in the float feed chamber due to depletion of the gasolene supply therein, the needle valve 10, is raised, permitting inflow of the hydro-earbon fuel, thus maintaining a constant level infthe floatfeed chamber. y

An air inlet passage 18, is provided, opening into the mixing chamber at the bottom thereof, and integral with the bottom of said mixing chamber, and extending axially upward thereinto is a sleeve 19. Below the floor or bottom 20, of the mixing chamber is a dash pot chamber, the walls 21, ef which are,integral with the bottom of the mixing chamber, and are internally threaded and closed at their lower edge with a. screw plug 22, threaded thereinto and properly gasketed. As shown,a passage 23, opens from the float feed chamber fitting loosely in said chamber is a piston 24, pro vided with a stem. 25, which extends upwardly through the sleeve 19, and above end is a double puppet valve 26 andv 2 which is integrally connected by a stem 23,

. bored to reeeive'the sleeve 19, axially and loosely thereinto, saidv bore being of a lengthto permit said 'valves to fully seat' or close.

The lower ofsaid puppet valves 26, seats 6'0 in, and closes an aperture n1 a substantially v j y 1,224,208

a concave under wall thereof to spread and deflect the upwardly flowing mixture pre"- ripherally around the same. Said upper puppet valve seats to close the mixing chamber at substantially the level of the top ofthe float feed chamber, as shown in Fig. 3, andis secured on the upper end of the stem 25, by means of a pin 30, extending therethrough.

As shown, the top of the carbureter, including the top 31, for the mixing chamber, and the cover 32, for the float feed chamber, integrally connected and carrying therein the various regulating mechanisms for adjusting and controlling the carbu.

reter, is rigidly secured in place by means of cap screws 33, and screws 3l, or in any other suitable manner. As shown, the walls affording the upper portion of the mixing chamber first diverge outwardly from the top of the puppet valve 27, thence converge inwardly to the top thereof, and are integrally connected with the apertured flange 35, whereby the carburetor may beattached to the manifold of the engine, and journaled through the top 31 on a shaft 35, is the butterfly throttle ,valve 37, adapted to whollyclose the mixing chamber from-the manifold. As shown, a throttle lever 38, is secured on the outer end of the shaft 36, for said throttle valve to permit the same to be actuated. Any suitable means, as, for instance, the stop 39, integral with 38, and set screw 40, at one side said throttle lever, maybe provided to limit the throw thereof in one direction to full opening, while any suitable stop l1, also integral` with lever 38, serves to limit the adjustment thereof to the other or fully closed position, as shown in Figs. l and 2, said stops contacting the integral lug 35a, on the flange 35 when in the aforesaid pob tions.

- Means are provided for accurately adjusting the needle valve to suit the requirements of low speed. For this purpose the stem 9, of the needle valve, which extends upwardly into a suitable seat 42, therefor in the upper or cover portion ofthe carbureter, is providedwith a spring 43, which acts to hold said needle valve normally downward to closed position. Extending through the above said needle valve, is a shaft 45, on which is secured an arm 4:6, which extends into a V Vshaped slot in the stem 9, of the Ill llO

needle valve` as shown in Fig. 3,.so that rotation of said shaft in one direction acts to elevate the stem of the needle valve to open the needle valve, and in the opposite direction acts to close said valve.

Rigidly secured on the outer end of said shaft 45, is an upwardly extending arm 117, having a threaded bore at the top thereof directed at a right angle with the shaft 45, and having threaded therein a set screw. 48,

lessees E provided on its outer end with a milled head 45.3, adapted to be held in adjustment by means ot a detent 50, set in an arm 5l, integral with said arm 47,

ecured on the shaft 45', and extending through the removable side wall 52, for said housing, is a sleeve 53, as shown in Fig. 4, having rocker arm 54, rigidly secured at the inner end thereof and slotted or yolred on its under side at its extremity, and provided with a bearing pin 54a atthe throat of said yoke. Rigidly secured on said sleeve at its outer end and at the inner side ot the arm 47, before described, and odset therefrom, an upwardly extending sleeve 55, in

which s journaled a shaft 56, having an ec# lcentric?, rigidly secured thereon 1n position tobear against the inner end of the set screw 48. y

Rigidly` secured at the upper end of said shaft 56, is a lever 58, which is directed transversely of the carburetor as 'shown in Fig. 2, and to the extremity of which is connected a wire or cable 59, which leads to a suitable bracket 6i?, secured on the top of the carbureter, and through a pipe 6l, and to a. suitable button or pull positioned conveniently to the operator.

As shown in lFig. ti', an unobstructed air inlet passage 62, is provided adjacent to, and slightly above the 'nozzle 7, of the needle valve to supply air at all times directly across the nozzle. As shown, a slightly raised lip or dam 64, is provided at the inner edge oi the floor or horizontal wall through which said nozzle opens to retain a small amount of the hydro-carbon exposed thereon for vaporization. A by-pass pipe 65, 'eX- tends from near the suraceof the hydro-car bon on said floor upwardly through the top wall of the carbureter, and opens by means of a passage 67, above the throttle valve into the manifold pipes, or, if preferred, the stem 9, of the needle valve may be bored to afvtord a passage 66, therethrough, continuing in a passage 67a, in the top of the carbureter, and opening above the throttle valve as before described.

An integral hub or collar 68, is provided on the upper face ot' the puppet valve 27, through which the pin 30. (whereby the puppet valve is secured on the stem)y eX# tends. Said hub isextended laterally and is provided with an upwardly opening slotJ thereinto, as shown in Fig. 4, and slidably supported therein is a. lever 69,` which eX- tends alongside the stem 9, of the needle valve, and at its extremity is pivotally engaged by means of a pin 70, upon a rod 71, which is threaded at its other extremity and 'has threaded engagement in an internally threaded sleeve 72, rotatably seated in a horizontal bore provided in the top of the cover for the float feed chamber. Said sleeve is provided at its outer end. with a.

recess in the upper edge of the bracket 74,

secured on the side of the float eed chamber integrally, it preferred, and in which is a' spring pressed detent 75, shown in dotted lines in Figs. 1 and 5, and which engages the milled periphery of said head and normally holds the samel from rotation. The rocker arm 54, at its yolred end lits over said lever 59, as shown in Figs. 4 and 8. Consequently, adjustment of the lever 69, longitu dinally by means or" rotation of said sleeve 72, varies the distance of the bearing of said rocker arm on said lever from the fulcrum for the lever just above the pin 70.v

As shown, a butterfly valve 76, is secured upon the shaft 77, to control the main air supply passage, and a lever 78, is secured on the outer end of said shaft 77, and is provided with notches 79, at ninety degrees apart, adapted to be engaged by a spring pressed detent 80,- as shown in Figs. l, 2 and 4, said detent acting to hold said valve either at fully open position or fully closed position, dependent upon which of said notches is engaged by said detent. This air inlet valve may be operated independently from the dash, if desired, and ordinarily is left fully open. It. may, of course, be controlled by mechanical connection between the same and the throttlelever 88, if desired. lf

unconnected therewith, however, it serves a.y

valuable purpose in protecting the device from unauthorized interference, or theft, in-

asmuch as when said valve is fully closed, as

shown in Fig. 3, the engine can only be op- A @rated at the slowest rate.

The operation is as follows:

ln setting the carburetor, the set screw 48, is adjusted against the sleeve 57, to afford a sui'licient elevation of the needle valve closure to supply a very limited flow of the hydrofcarbon, but ,sufiicient to operate the engine at lowest speed, the air to supply the very rich mixture being admitted through the constantly open air port 62, adjacent the needle valve, and the rich mixture afforded thereby passing up through the pipe and passage 65, to a point above the throttle valve, which remains practically closed, and, of course, shutting oli' nearly all supply of mixture or air through the puppet valves andfbutterfly valves hereinbefore described. The pressure ofthe set screw 48, against the cam 55, andthe terision exerted by the spring 48, to' 'hold the needle valve. closed, is opposed by the pressure of the rocker arm 54, on the lever, 69. In consequence, the low speed adjustment effected by the set screw 48, remains as a constant adjustment for low speeds and insures the same degree of open' ving for sald needle valve at all times when starting and particularly in cold weather, the

shaft 56, is rotated by a pull on the cable 59, bringing the cam 57, into engagement with the set screw 48, and further elevating the needle Valve against the tension of its spring. Immediately upon release, however,

of vthe cable or wire 59, the spring 43, acts admitted as mentioned, is delivered pe ripherally around the puppet valve 27, and thence into the manifold past the throttle valve. -The dash pot afforded bythe gasolene chamber below the mixing chamber in which the piston 24, secured on the stem 25, is placed, insures the uniform operation of the puppet valves under all conditions. Said dash pot holds said valves from fluttering due to the possible unequal action of the cylindersor due to vibrations occasioned I through the operation of the vehicle, or

other device, and limits the movement of said valves to the proper requirements of the engine.

The adjustment of the hydro-carbon supply for high speed is effected through the medium of the lever 69. rlhis is adjusted longitudinally by means of rotation of the milled head 73, which threads the shaft 7l, into or out of the sleeve 72, thereby varying the distance of the fulcrum pin 70, from the bearing pin.55, in the end of the yoke, and with a given elevation of the free end of said lever 59, the greater the distance between saidv fulcrum pin 70, and bearing pin 55, the greater the opening of the needle valve through the medium of the shaft a5, and arm 46. Consequently, a very accurate adjustment may be thereby effected to adapt the supply of the hydro-carbon to the requisite air supply to alord perfect combustion at the highest attainable speed. Any intermediate throttle adjustment lifting the puppet valves to proportionately a less height, aiiords decreased flow of hydrocarbon and consequently the supply is at all times exactly adjusted to the requirements of the engine.

It is, of courseftobe understood that I have shown but a preferred form of my mvention, and I am aware that details of the construction and operation may be varied through a wide range. I thereforedo not purpose limiting the patent granted on this application otherwise than necessitated by the prior art. y

I claim as my invention:

l. A carburetor embracing a source of hydrocarbon supply, a valve controlling the same, a mixing chamber in open communication with the hydro-carbon from said valve, connected valves afording the top and bottom of said chamber, a throttle valve above the same, an air inlet passage below the same, a normally open air port adjacent the needle valve, a passage leading from near the needle valve into the manifold beyond the throttle valve, and adjustable means affording an initial open ing of the needle valve independently of the opening of the throttle.

2. In a carburetor of the class described, a source'of hydro-carbon supply, a needle valve controlling the same, a mixing chamber to receive the supply from the needle valve, a normally open air inlet adjacent the' needle valve, a throttle valve controlling the flow of mixture from the carbureter, a by-pass passage leading from near` the needle fuel valve into the outlet from the carburetor beyond said throttle valve, a gravity acting valve to control the iiow from the mixing chamber toward said throttle valve, operative connections between the same and said needle valve, and regnlable means affording a constant opening of said needle valve for operation of the engine at low speed independently of said second mentioned outlet valve.

3. In a carbureter a source of hydrocarbon supply, a needle valve controlling the same, an air port adjacent the needle valve, a mixing chamber, throttle and controlling outlet valves therefor, a dash pot controlling one of said valves, and a passage leading from near the needle valve to the manifold and adapted to deliver a rich mixture into themanifoldl prior to the opening of said valves.

4. A carburetery embracing a source of hydro-carbon supply, a needle valve controlling the same, a mixing chamber, a throttle outlet valve, a controlling outlet valve therein operable independent of the throttle valve, a lever connected with said controlling valve and acting to control the opening of the needle valve, and a passage leading from the needle valve around said controlling valve to deliver a rich mixture into the manifold when said valve is closed.

5. In a device of the class described a mixing chamber comprising the side walls and upper and lower automatic puppet valves affording the top and bottom respectively of said chamber, a dash pot, a piston therein, a stem secured to said piston and n connected with said valves, a needle valve ico lio

late the opening of the needle valve 'in proportion to the opening'of said valvesf 6. ln a carbureter a source ol hydro-carbon supply, a needle valve, a mixing chamber to receive the supply' from the needle valve, a constantly open air inlet port to Asaid mixings chamber, a throttle valve, a passage leading from the mixing chamber into the manifold to supply a rich mixture thereto when the throttle is closed, a control valve normally closing the outlet from the mixing chamber and operated automatically, a lever operated by said valve and operatively connected with the needle valve to open said needle valve proportionately with the lift of said valve, and means adjustng said lever to vary the lift of the needle valve.

7. ln a device of the class described an automatically acting puppet valve controlling the discharge of mixture to the manifold when the throttle valve is open, a lever adjustably connected therewith and operatively connected with the suppl.,v valve for the hydrocarbon, and acting to adjust the opening of said valve to correspond with the degree of opening of said puppet valve, and means adjusting said 'lever to vary the opening of the supply valve with a given lift of said puppet valve.

8. ln a device oi" the class described a source of hydro-carbon supply, a needle valve controlling the same, embracing1 a nozzle and a rcciprocable stem, a spring tending to hold said stem normally in closing position, a bell crank lever engaged to lift the stem, a set screw mounted in said bell crank adapted to lift the stem of the needle valve against the tension of its spring, and an" automatically actuated lever acting on said bell crank to vary the lift of the vneedle valve with the rate of mixture consumption, and connected inlet and outlet valves adaptf ed to actuate said lever.

9. ln a device of the class described means aiiordiiig a rich mixture for preliminarily starting the engine, and including mechaaffording a regulable opening for the fuel supply valve, a constantly open air inlet port fthereto and a by pass passage lirougli vlfliich the rich mixture is delivered ast the t rottle valve, automaticallyl acting 'alves operating when the throttle valve is in to supply a mixture to the engine, and yer operated by one of said valves and ficting to valve to the rate of mixture consumption.

l0. ln a carbureter of the class described, :ource of hydro-carbon supply, a valve rolling the discharge therefrom, a mix- O chamber to receive said supply disposed so as to hc normally in open communication lo'vv ifrein said needle valve, an automatically operating valve affording one l ber.

the Opening of the Supply wall 'of said mixing chamber, a dash pot in communication with the hydro-carbon supply to control the operation of said automatic valve` an air inlet valve for the carbui'eter ,positively operated by said automatically acting valve and also controlling the inlet of air to said automatically operating valve, and a lever operated by said automatically acting valve to vary the degree of opening of the hydrocarbon supply valve.

ll. ln a carinii-eter of the class described, a mixing chamber, connected automatically acting; valves controlling: the inlet and outlet thereof, an inlet hydro-carlmii valve inopeii communication with said ii'iixiiig chamber iii the space between said inlet and outlet valves, means retin-ding the movement otsaid inlet and outlet valves, and operative connections between said inlet and outlet valves and said needle valves.

l2. ln a device ot.' the class described a mixing chamber, a needle fuel valve therein, an air port adjacent thereto. connected valves affording an inlet and outlet to said mixing` chamber, a dash pot connected with said valves and with the source of fuel for said needle valve, and a throttle valve disposed to control the ioiv of mixture be yond the outlet valve of said mixing chain-- 13. ln a device of the class described e. needle. valve, a mixingchamber, an air inlet valve therein, a mixture outlet valve adapted .to be operated, by the suction of the cvludci's of :in engine, and a throttle valve disposed beyond said mixture outlet valve` to zgovern the suction on said valves on the opening thereof, and means connecting id mixture outlet valve with said air inlet valve to proportionately open the latter vsith movement ofv s aid outlet valve.

14. ln a device of the class described a mixing chamber, connected valves ailorf ing inlet and outlet therein, a Jfuel valve uected therewith and opeietable there air port adjacent said valve and ac maintain said mixing chamber at plieric pressure, and a throttle val c nectcd beyond said mixing'chamber outlet valve to zgovern the opening of the latter by controlling the diiiercnces of pressure thereon. c

l5. In a de vice of the class/ describefl a mixing chamber, an automatic outlet valve therein, an inlet air valve operated by said oiutlet valve, and means connected vv; h said olitlet valve to open the fuel valve with a corresponding movement of mixing chhainber outlet valve, said fuel vllve disposed between said throttle valve and said inlet air valve, a fuel valve, and adjustable means connected between the same and said inlet and outlet valves to insure proportionate opening of each.

17, A carbureter comprising a mixing chamber, a manually operatable inlet valve therefor, a. manually operatable throttle outlet valve therefor, automatic inlet and outlet valves disposed between said manually operated valves, a fuel valve and means connected with said fuel valve and said automatic valve to insure proportionate opening of each.

18. In a device of the class described a n'iixing chamber, manually operatable valves controlling the inlet and outlet therefrom, automatically operated inlet and outlet valves in said mixingchamber disposed intermediate said manually operatable valves, a fuel valve connected to open with a corresponding movement of said l automatic valves, and means to prevent fluttering thereof.

19. ln a device of the` class described a mixing chamber, manually operatable inlet and outlet valves therefor, automatic valves interposed therebetween, a fuel valve connected with said automatic valves to insure proportionate opening of each, an auxiliary.

a easing having an air intake and a floatehamber, of an automatically-controlled air intake valve, a mixture outlet valve connected thereto for movement therewith', a fuel valve, a lever adapted to be actuated by said connected valves and bodily adjustable to vary the distance between its fulcrum and the point of engagement with the air valve, and an independently fulcrumed lever connected with the fuel valve and adapted to be actuated by the first said lever.

22. In a carbureter, the combination with a casing having an air intake and a fuel inlet, of an automaticallycontrolled air `intake valve,I a mixture outlet valve connected thereto, a fuel valve, two levers, one adapted to be actuated bysaid connected valves to rock the other and the latterK engaging the fuel valve, and means for varying the relation between said levers, for the purpose described.

24. In a carburetor, the combination with 7b a casing having an air intake and outlet and a fuel inlet, of automatically-controlled intake and outletcvalves, afuel valve, two independently iulcrumedlevers, one engaging` at its freev end with the fuel valve and n the other adapted to be actuated by the auton'iatically-controlled valves, a connection between said levers, and means for bodily shifting one of said levers' to vary its effective length. i

25. In a carbureter, the combination with a casing having-an air intake and a float chamber, of automatically-controlled 'intake and outlet valves, a lever adapted to beactuated by said valves, a fuel valve, and a `see ond lever engaging the fuel valve and extending substantially parallel to and adapted to be actuated by the first said lever.`

26. in alcarbureter, the combination with a casing having an air intake and a fuel inlet, of automatically-controlled connected valves, a fuel. valve, two levers, one adapted tobe actuated by said connected valves to rock the other and the latter engaging the fuel valve, and means for shifting one of said levers bodily to vary the relative movements of the valves.

27. ln a carbureter of the class described, a mixing chamber, an air inlet to said mixing chamber, a mixture outlet from said mixing chamber, suction controlled valves in said air inlet and said mixture outlet lconnected so that each opens and closes harm moniously with and relative to the other, a fuel inlet discharging into said mixing chamber betweenV said air inlet and said mixture outlet, means operable bythe nievement of .said valves for varying the discharge capacity of said fuel inlet correA spondingly with the position of said valves.

28. In a carbureter of the class described, a mixing chamber, an air inlet to said inixing chamber, a mixture outlet from said mixing chamber, suction controlled 'valvesin said air inlet and said mixture outlet connected so that each opens closes harmoniously with and relative to the other,l acarbureting chamber having air and fuel inlets, said chambir discharging into said mixing chamber between said air inlet and said mixture outlet valves, .means operable i by the movement of said valves for varying the discharge capacity of said fuel inlet. v

a carbureter of the class described., a mixing chamber, an air inlet to mixn ing chamber, a mixture outlet from" seid mixing chamber, suction controlled vulves y in said air inlet and said mixture outlet eonneeted so that each opens and closes hermonlously with and relative te the other,

'e fuel inlet discharging inte seid mixing vchamber between 'Saul efr inlet-end said mixture outlet emlmeans opposing suction for returning sani valves to their normal position, and means for retarding the movefuel inlet discharging into said mixing chamber between said valves, a needle valve in said fuel inlet7 means controlled by the movements .of Suid valves for varying the discharge capacity of such fuel inlet correspending with the position of said valves, und means for altering und adjusting the ratio of movement between seid air and mixture valves und said needle Valve.

ln testimony whereof l have hereunto subscribed my name in the presence of tWo subscribing Witnesses.

CHARLES L. RAYFELD.

`iftitnesses:

y C. W. Lrrnnnsnn,

CHARLES W. HILLS, Jr. 

